I have had this new unit less than a week and it has been nothing but problems.  This is a replacement for the exact same model that lasted just 4 years before the thermostat stopped functioning.  This one seems to have the same problem.  Actually, this one's problem seems to be much worse.  I am sitting here right now with it turned to 65 degrees in an effort to get it to cool - room temperature is now climbing to over 80.  The compressor kicks in but stops either immediately or after much too short a period to cool the room.  Bad news - I have a brand new air conditioner that does not work and this is the first day of a forecast 7-day heat wave.